Optimize mounts

[solarkraft]

Currently a lot (all of the Dokuwiki installation?) is thrown into /config, much more than needed.

Idea: ./config, ./data, cache as volume

From Readme:

config/dokuwiki/conf/
config/dokuwiki/data/
config/dokuwiki/lib/ -> volume?

[solarkraft]

Success metric: It should be possible to rebuild the container without losing meaningful local state.

[solarkraft]

./data/conf/:/config/dokuwiki/conf/
./data/data/:/config/dokuwiki/data/
./data/lib/:/config/dokuwiki/lib/

Leads to

DokuWiki Setup Error

The datadir ('pages') at /pages is not found, isn't accessible or writable. You should check your config and permission settings. Or maybe you want to run the installer?

including after running fixperms.php, which reports no errors, but only lists paths in /app.

[solarkraft]

It works just fine with no mounts at all. Errors as soon as /config/dokuwiki/conf is a volume. /config/dokuwiki/data does not cause issues.

All of /config/dokuwiki/ being mounted does not cause problems.

All directories inside of /config/dokuwiki/ being volumes individually results in the same error.

We're copying stuff into /config/dokuwiki/conf, aren't we?

[solarkraft]

Turns out that it all works when you docker-compose down between changes.

[solarkraft]

Nope, not always.

/config/dokuwiki/conf as a volume (semi-) reliably produces the issue on Docker for macOS. With Lima it's no problem (but it doesn't work properly with this container due to lima-vm/lima#231). Cool.

Issue also present on Linux.

[solarkraft]

Turns out that it all works when you docker-compose down between changes.

I wish. Not at all, actually. I wonder why it briefly seemed to work.

[solarkraft]

If /config/dokuwiki/conf exists before the step "Move user folders to persistent storage" in 50-config (which it does when explicitly mounted), the error occurs.

However it's apparently not due to the [[ -d /app/dokuwiki/"${i}" ]] && \ check (only copies if the directory doesn't exist) - it also occurs when conf is explicitly copied. It does not seem to directly relate to the copying of data/pages, as that happens either way.

[solarkraft]

Related to dokuwiki/dokuwiki#3520 ?